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At what angle for the first - order diff...

At what angle for the first - order diffraction, spacing between two planes respectively is `lambda and (lambda)/(2)`?

A

`0^(@), 90^(@)`

B

`90^(@),0^(@)`

C

`30^(@), 90^(@)`

D

`90^(@), 30^(@)`

Text Solution

Verified by Experts

The correct Answer is:
c
`2d sin theta + n lambda` (Bragg's equation)
For `n = 1`
`2d sin theta = lambda`
(i) If `theta = 30^(@) rArr 2 d sin 30^(@) = lambda`
`:. d = lambda`
(ii) If ` theta = 90 ^(@) = 2d sin 90^(@) = lambda `
`d = lambda //2`
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